Gas-pump for ice-making machines



(No Model.)

T. L. RANKIN.

GAS PUMP POR 1GB MAKING MACHINES. No. 405.503.. Patented June 18,1889.,

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WITNESSES v [JV /ENTUR E02, n i3/@wea MLSLWMM ftorney which form UNITED* STATES PATENT OFFICE.

TIIOMAS `L. l RANKIN,` 0F PHILADELPHIA, PENNSYLVANIA.

GAS-PUMP Foa ICE-MAKING MACHINES.

SPECIFICATION forming part of Letters Patent N o. 405,503, dated June 18, 1.889. Application nea- Jmary 2a, 188s. .Renewed March 29, 1889. saturo. 305,335. (No miei.)

To all whom t may concern..-

Beit known that'l, THOMAS LRANKIN, of Philadelphia, State of Pennsylvania, have invented certain new and useful 'Improvements in Gas-Pumps forIce-.Making Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the-accompanying drawings, and to the letters of reference marked thereon,

part o f this specification, vin which- Figure l represents avertical sectional view of my improved pump. Fig. 2 represents adetached longitudinal sectional View o f the pump-cylinder, showing the induction and eduction valves thereof. l

This invention relates to certain improvements in gas-pumping lmachinery especially designed for 'use in that class of ice-machines in which the refrigeration is produced by the expansion of ammonia; and it has for its ob-` jects to provide for :more thoroughly and effectively lubricating the pistons of the pump and for cooling the oil employed for the 'purpose, as more fully hereinafter\ specified. These objects I attain by the means Villustrated in the accompanying drawings, in which- LetterAindicates the cylinder of the pump, which in the present instance is mounted horizontally upon the supports B, but which may be mounted vertically in any convenient manner. Midway between the ends of the cylinder is an opening, `and the cylinder at said opening is provided withv a stand-pipe C,which is fianged at its lower end and bolted or oth erwise secured to the cylinder. In the present instance it rises vertically at right angles to the pump-cylinder; but in case the pumpcylinder is arranged vertically the stand-pipe will be provided with a curve at its lower end and will extend vertically and parallel with said pump-cylinder. At each end the pump-F cylinder is provided with valve-chests D D, provided with autom ati cally-acting puppet or other valves E F, one chest at each end of said cylinder connecting with the inductionpipe G, and the other at each end withC the eduction-pipe I-I, leading by means of a pipe I to the upper part of the stand-pipe C.

The letter L indicates the pistons of t-he pump, one located and moving at each side of the central opening in the pump-cylinder. The said pistons are mounted-on the piston-rods M, which are connected with each other by an adjustable connection. Midway between the ends of thepumpylinder is located a dede tor R,which has a central opening, through w ich the piston-rods and their connection work, the object of which will be hereinafter specified. The letter S indicates a pipe leading into the cylinder'at each side of the cent-ral opening leading to the stand-pipe and provided with stop-cocks or valves T, and also with valves U,

the latter of which are held in a normal position by means of `the levers or arms V and springs W, for the purpose hereinafter exfplained.

In the lower part of the stand-pipe is located a coiled pipe X, the ends of which extend outward through suitable packing-boxes Y, and which connect with awater or gas supply, by means of y which a current may be made to circulate through said coils for the purpose of cooling the oil inthe stand-pipe and cylinder.

The letter Z indicates the pipes leadingto' the condenser.

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The operation of my improved machine is as follows: The spacebetween the pistons and leading to the stand-pipe is Afilled with oil,

which packs the pistons, preventing any escape of gas between them and the cylinder, while at the same time it lubricates the pistons. During the reciprocation of the pistons the pipe S permits a portion of the oil at each stroke of the pistons to enter the cylinder between on'e of the pistons and the end of said cylinder, in order to insure thorough lubrication of the piston. This is accomplished. by means of the arms or levers V, which are act-uated alternately. The valves U in pipe S are preferably arranged to be automatically operated'by means of tappets connected with the motor, but not shown in the drawings, which operates the pump. The quantity of oil admitted is regulated by'means of the valves. It will be observed that the high pressure is on the 'inside of the pistons and the low pressure on the outside of the pistons or between the same and the heads of the cylinder. The

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difference of pressure, it is evident, will force t the oil to thelow-pressure side when the valves V are opened without the employment of pumps or other forcing devices; The valves may be so set as to inject the oil on the compression-stroke of the pump. The ammonia gas is forced from the stand-pipe through the pipe Z to the condenser.

Having` thus described my invention, what I claim, and desire to secure by Letters Patent, 1S

1. The combination, with the cylinder naving,r a central opening communicating with a stand-pipe, of the deflecting plate located thereinbelow the opening leading to the standpipe to insure the proper circulation of the oil, substantially as specified.

2. The combination of the cylinder A, the

connected pistons L L therein,the stand-pipe` communicating therewith, and the valved pipe S, supplying oil to the cylinder between its heads and the piston,-With the valved boxes at the cylinder-heads, respectively, having induction and eduction pipes connecting with the same, all constructed and arranged substantiallyin the manner and for the purposedescribed.

3. The combination of the cylinder, the stand-pipe centrally connected thereto, and the cooling-coil 'in said pipe with the deflecting-plate secured centrally in said cylinder and the adjustably-connected pistons, all constructed and arranged substantially as and for the purpose described.

4. -The combination of the cylinder, the stand-pipe communicating therewith, and the induction and eduction pipes and valves with the deecting-plate, the pistons arranged on opposite sides of said plate, and the connections between said pistons for moving them together, all constructed and arranged substantially in the manner and for the purpose described. v

In testimony that I claim the foregoing as my own Iaifx my signature in presence of two witnesses.

THOMAS L. RANKIN Witnesses:

T. Il. ALEXANDER,

M. I. CALLAN. 

